Comment 19 for bug 1611010

Problem installing Xenial most recent daily desktop AMD64 builds (3 previous days) while selecting English keyboard and Ecuador timezone.

Same problem of crash during setting language.

Workaround was updating sources.list, update, reinstall apt tzdata language-selector-common language-pack-en-base language-pack-en (everything was up to date so I doubt this did anything) followed by running ubiquity and selecting a US location to match the keyboard.

This went fine after various failed attempts and ubiquity previously crashing every time on setting language. Now location merely needs to be updated on reboot, if it isn't broken.
Perhaps doing this after all other things in the installer...